EP0330440A1 - Kühltürme - Google Patents

Kühltürme Download PDF

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Publication number
EP0330440A1
EP0330440A1 EP89301696A EP89301696A EP0330440A1 EP 0330440 A1 EP0330440 A1 EP 0330440A1 EP 89301696 A EP89301696 A EP 89301696A EP 89301696 A EP89301696 A EP 89301696A EP 0330440 A1 EP0330440 A1 EP 0330440A1
Authority
EP
European Patent Office
Prior art keywords
media
air
cooling tower
plenum
entering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89301696A
Other languages
English (en)
French (fr)
Other versions
EP0330440B1 (de
Inventor
Bryan F. Garrish
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baltimore Aircoil Co Inc
Original Assignee
Baltimore Aircoil Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22568900&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0330440(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Baltimore Aircoil Co Inc filed Critical Baltimore Aircoil Co Inc
Priority to AT89301696T priority Critical patent/ATE100572T1/de
Publication of EP0330440A1 publication Critical patent/EP0330440A1/de
Application granted granted Critical
Publication of EP0330440B1 publication Critical patent/EP0330440B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
    • F28C1/02—Direct-contact trickle coolers, e.g. cooling towers with counter-current only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/11—Cooling towers

Definitions

  • This invention relates to cooling towers wherein heat is exchanged between water and air, and more particularly involves an improved counterflow cooling tower with heat transfer media construction and method of operation which enables the vertical dimension of the cooling tower to be reduced and improves airflow through the media.
  • counterflow cooling towers The design of counterflow cooling towers is a well developed technology.
  • heat transfer media comprising a plurality of fill sheets are mounted vertically and slightly spaced so as to provide vertical air channels between adjacent sheets, and ambient air is passed upwardly while heated water is flowed downwardly on the surface of the sheets to effect heat exchange to cool the water.
  • the fill sheets have been relatively flat parallelo­grams, usually rectangles, of relatively impervious material with surface embossments to keep adjacent sheets spaced apart and to distribute a film of water on each surface.
  • Such sheets have been arrayed in a horizontal bank with the lower edges positioned horizontally and held generally parallel and even with one another at a uniform distance above a water sump or pool in the bottom of the cooling tower so as to provide a rectangular plenum for air to enter beneath the fill sheets, as shown, for example, in U.S. patent No. 3,132,190 to Engalitcheff Jr.
  • a water distribution network is located and balanced so as to deliver substantially uniform rates of water flow to all portions of the fill sheets; and above that an air outlet is located.
  • heat transfer media may be employed in a cooling tower, such as serpentine or coiled tubing wherein another fluid is circulated, and combinations of fill sheets and tubing.
  • the present invention is also applicable to such other heat transfer media which is referred to herein collectively as media.
  • a method of moving air through a counterflow cooling tower wherein water is passed downwardly through heat transfer media while air is moved generally upwardly from a plenum beneath said media comprising: entering a layer of air in a general horizontal direction into said plenum from one side of said plenum; and causing at least portions of the generally horizontally moving air to move upwardly at points where said air impinges the heat transfer media, the boundary of the heat transfer media and said plenum being disposed at a decline from said one side of said plenum and across the layer of said entering air.
  • a counterflow cooling tower wherein heat transfer media is arranged in a vertical bank so as to be wetted by descending water which is contacted by air entering from one side of said cooling tower beneath the media and passing generally upwardly through the media, said cooling tower comprising: a plenum space beneath said media for entering air, said plenum having an interface with the lower portion of said media which interface declines downwardly from said one side.
  • the present invention allows for a reduction in the overall height of a counterflow cooling tower by organizing heat transfer media in a non symmetrical arrangement therein so that a lower boundary of the media is inclined downwardly toward the bottom of the tower from an air entry side toward a far side of the cooling tower, so as to form a sloped interface with a triangular air plenum from which the horizontally entering air tends to move substantially upwardly upon reaching the media.
  • the present invention provides for arranging the media within a cooling tower to slope downwardly from an air entryway, thereby obstructing incremental layers of air moving horizontally into the plenum below the media and turning the incremental air flow upwardly as each layer reaches media interfacing the plenum.
  • a preferred form of media is fill sheets of trapezoidal shape suspended so as to be parallel to the direction of entering air flow.
  • FIG. 1 An induced draft counterflow cooling tower is illustrated in Figure 1 wherein a plurality of heat transfer media generally 10 are suspended within a generally rectangular enclosure comprising vertical walls 12, a bottom basin 14 (or sump) and an overhead cowling 16 shaped to form a transition cover extending from the walls 12 to an exhaust fan ring 18 which surrounds and supports a multibladed fan 20 driven by an electric motor 22.
  • the motor 22 is mounted on the exterior of the cooling tower so as to be clear of the highly humid air discharged therefrom; however the motor 22 may be located within the tower or above the fan discharge.
  • the motor 22 is supported on the cowling 16 and is drivingly connected to the fan 20 by an endless belt 24, or the like, extending between sheaves on the motor shaft and fan shaft.
  • air is drawn horizontally through an entry way 28 in only one side wall into a plenum space 36 within the cooling tower and moves upwardly between the media 10 and exits through the fan ring 18.
  • the bottom of the cooling tower comprises an enclosed basin or sump 14 to receive a descending flow of water that is sprayed on the media 10 from an overhead distribution network comprising a water main 38, distribution pipes 40 and spray nozzles 42. Water is discharged from the basin 14 through a discharge conduit 48.
  • a plurality of mist eliminator baffles 50 is positioned above the media 10 and may be conveniently supported above the water distribution pipes 40.
  • a preferred form of media 10 in the present invention is non-rectangular fill sheets 58 having trapezoid shaped faces 60 which sheets are suspended in the cooling tower so as to have a horizontal upper edge 62 and a sloped, non-parallel lower edge 64 which extends from a short side edge 66 downwardly, to an opposite parallel and longer side edge 68.
  • a plurality of such fill sheets 58 are suspended within the cooling tower with the short side edges 66 disposed toward an air entry side so that the lower edges 64 decline away from the top of an air entry way 28 toward the basin 14 thereby forming a sloped boundary and interface respecting the plenum space 36.
  • the present invention involves a novel method of operation by orienting the interface between heat transfer media and air plenum to slope downwardly from the top of the air entrance side of a cooling tower and thereby resisting continued horizontal movement of increments or layers of air and turning such increments of air to move upwardly through the media.
  • the present method involves increasing the depth of the media as the distance from the air entrance increases (by maintaining the media top substantially at a horizontal level) thereby progressively lengthening both the horizontal and vertical air paths and hence increasing the flow resistance for successive increments or layers of air entering the cooling tower. This results in a relatively greater amount of air flow upwardly at the air entrance to the cooling tower as compared to towers having a horizontal interface between media and plenum and an even depth of media across the tower.
  • the fill sheets 58 are oriented to position the faces 60 parallel to the entering air flow (as designated by the arrows "A").
  • there are a plurality of substantially identical parallel fill sheets 58 each extending the full vertical depth of the media.
  • such media may be constructed of stacked layers (not shown) wherein the upper layer (or layers) may comprise rectangular sheet components arranged vertically, and either parallel or crosswise to the lowermost fill sheets, so long as the latter present a sloping interface with the air plenum 36.
  • the sloping interface is obtained by employing non-rectangular fill sheets and orienting a diverging edge 64 downwardly across the plenum 36, and while trapezoidal faces 60 as shown are preferred, it is possible to utilize a triangular fill sheet (not shown).
  • mist eliminator baffles 50 are mounted crosswise to the fill sheets (as shown) so as to function to both deflect and guide discharge air away from the intake air space and collect air entrained moisture droplets.
  • baffles 50 may be repositioned if air is to be deflected in a different direction.
  • the water distribution spray nozzles 42 may be adjusted to supply relatively lesser quantities of water adjacent the fill sheet short side edges 66 as compared to the longer side edges 68 to partially balance the effect of the relative cooling paths of increments of water descending along the fill sheet faces 60 when appropriate to fill height and density conditions. However, that effect is also at least partially balanced by a relatively lower resistance to air flow, and hence greater rate of air flow, across the shorter cooling paths.
  • the preferred fill sheets have sloped lower edges 64 there is a tendency for some of the descending water to temporarily collect in the form of beads which run down the lower edge rather than to drop into the plenum space 36. In excessive amounts and circumstances such beading on adjacent fill sheets could bridge the space between sheets and interfere with air flow distribution. To counteract such a possibility the lower edges 64 of interdigitating fill sheets are alternately offset a small vertical distance (as shown by a phantom line 70 in Figure 1.
  • fill sheets generally 10 are shown in Figure 5 which also illustrates the method by which such sheets with trapezoidal faces 60 are made.
  • Formed rectangular stock 80 of plastic film is available as the usual type of rectangular fill sheet in a wide range of dimensions.
  • Such stock usually is embossed with a uniform pattern of contours 82, which define pathways and generally increase the surface area across which water is spread in the cooling tower, and one or more stiffening ridges 84 and margins.
  • the stock is embossed to include a plurality of spacer projections 86 extending in two directions perpendicular to the plane of the sheet which projections nest when the sheets are stacked but serve to keep adjacent sheets spaced apart when suspended in a cooling tower in an offset interdigatating manner.
  • the rectangular stock 80 is cut at an angle, as shown by the dashed line in Figure 5, between points on opposite sides equally spaced from the longer edges thereof.
  • the specific dimensions and the slope angle of the non-parallel edge may be adapted to the size limitations of a cooling tower.
  • FIG. 2 structural elements corresponding to those heretofore described are denominated by the same reference character with a prime notation.
  • an air duct 90 extends outwardly from one cooling tower wall 12′ and a fan 20′ is mounted to force air through the duct 90 into the plenum space 36′.
  • the heat transfer media is shown to comprise parallel rows of serpentine tubes 72 connected between inlet and outlet headers 74 and 76, respectively, and aligned with the incoming air. This type of media permits an additional fluid to be cooled as it is flowed through the serpentine tubes. It will be noted that each successive descending run of the serpentine tube 72 is shortened so as to define a sloping interface with the plenum 36′.
  • FIG. 3 illustrates a preferred embodiment of the present invention utilizing trapezoidal fill sheets 58 ⁇ in a forced draft counterflow cooling tower having a centrifugal fan 94.
  • the fill sheets 58 are aligned with the incoming air propelled by the fan 94 through a transition duct 96. It has been found that the horizontal distribution of air from such a fan 94 is improved if the fan shaft 98 is slightly elevated and the fan discharge aimed through a gradually flared transition duct 96 which expands to approximately the dimensions of the inlet side 28 ⁇ of plenum 36 ⁇ .
  • Another advantage of aligning the fill sheets 60 ⁇ with the forceful air streams from a centrifugal fan 94 is that the lower edges 64 ⁇ of the sheets have a lessened tendency to flutter and thereby air flow between the sheets is facilitated.
  • An example of a forced draft (centrifugal fan) counterflow cooling tower having exterior width and length dimension of 48 x 71 3/4 inches (1.2 m x 1.82 m) (exclusive of fan and entry duct) and height of 78 3/4 inches, (2.00 m), containing seventy eight trapezoidal fill sheets suspended lengthwise, can supply approximately 55.9 tons (50.7 tonnes)of cooling capacity by cooling 167.7 gallons of water per minute from 95°F (35°C) inlet to 85°F (29.5°C) discharge using 15670 cubic feet (443909 litres) per minute of 78°F (26°C) ambient air supplied by a centrifugal fan driven with a 5 horsepower (3.7 kw) motor.
  • FIG. 4 illustrates an induced draft cooling tower provided with two air entry ways 28a and 28b at opposite walls 12 ⁇ of the cooling tower and two banks of fill sheets 10a and 10b above plenum spaces 36a and 36b.
  • the cooling tower is generally symmetrical about a central vertical plane and parts corresponding to those described in connection with Figure 1 are denominated by the same reference character with a double prime notation. It is also possible to construct a forced draft embodiment of a symmetrical unit similar to the induced draft embodiment of Figure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP89301696A 1988-02-22 1989-02-22 Kühltürme Revoked EP0330440B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89301696T ATE100572T1 (de) 1988-02-22 1989-02-22 Kuehltuerme.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US158603 1988-02-22
US07/158,603 US4873028A (en) 1988-02-22 1988-02-22 Low silhouette cooling tower with trapezoidal fill and method of air flow therethrough

Publications (2)

Publication Number Publication Date
EP0330440A1 true EP0330440A1 (de) 1989-08-30
EP0330440B1 EP0330440B1 (de) 1994-01-19

Family

ID=22568900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89301696A Revoked EP0330440B1 (de) 1988-02-22 1989-02-22 Kühltürme

Country Status (25)

Country Link
US (1) US4873028A (de)
EP (1) EP0330440B1 (de)
JP (1) JPH01252894A (de)
KR (1) KR940008437B1 (de)
CN (1) CN1014272B (de)
AR (1) AR243275A1 (de)
AT (1) ATE100572T1 (de)
AU (1) AU596941B2 (de)
BR (1) BR8900765A (de)
CA (1) CA1318239C (de)
DE (1) DE68912361T2 (de)
DK (1) DK81589A (de)
ES (1) ES2050227T3 (de)
FI (1) FI890745A (de)
IE (1) IE62060B1 (de)
IL (1) IL88881A (de)
IN (1) IN171510B (de)
MX (1) MX172682B (de)
NO (1) NO890397L (de)
NZ (1) NZ227582A (de)
PH (1) PH26165A (de)
PL (1) PL277861A1 (de)
PT (1) PT89785B (de)
RU (1) RU1819342C (de)
ZA (1) ZA89187B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2168899A1 (es) * 1998-05-11 2002-06-16 John Albert Davis Construccion mejorada de una torre de refrigeracion.
WO2012072829A1 (es) * 2010-11-29 2012-06-07 Zincobre Ingenieria, S.L.U. Torre de refrigeración y método de limpieza
CN110906755A (zh) * 2019-12-04 2020-03-24 寇金臣 一种尾气回收节能冷却塔

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724828A (en) * 1995-04-21 1998-03-10 Baltimore Aircoil Company, Inc. Combination direct and indirect closed circuit evaporative heat exchanger with blow-through fan
US5663536A (en) * 1995-10-10 1997-09-02 Amsted Industries Incorporated Sound attenuation assembly for air-cooling apparatus
US7612999B2 (en) * 1998-09-18 2009-11-03 Flo Healthcare Solutions, Llc Mobile clinical workstation
DE10145414B4 (de) 2001-09-14 2013-09-12 Aloys Wobben Verfahren zur Errichtung einer Windenergieanlage, Windenergieanlage
WO2004067959A1 (de) 2003-02-01 2004-08-12 Aloys Wobben Verfahren zur errichtung einer windenergieanlage sowie windenergieanlage
CN103225971A (zh) * 2013-03-21 2013-07-31 无锡市恒达矿山机械有限公司 一种气体冷却塔
KR101363006B1 (ko) * 2013-07-10 2014-02-14 주식회사 성지공조기술 냉각탑 공기분배 장치
KR101512748B1 (ko) * 2014-02-06 2015-04-16 쿨앤쿨주식회사 제습기 연동형 냉각탑
CN105258530B (zh) * 2015-11-26 2017-11-17 广州览讯科技开发有限公司 冷却塔节水消雾用换热器
KR101867072B1 (ko) * 2016-09-01 2018-06-12 주식회사 휴먼에어텍 냉각탑
CN106705698A (zh) * 2016-12-27 2017-05-24 中国人民解放军火箭军工程设计研究所 地下空间两级冷却塔进排风串联冷却系统
CN108195220B (zh) * 2017-12-21 2019-07-16 巴尔的摩冷却系统（苏州）有限公司 一种冷却塔填料安装的扩紧杆及辅助治具

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DE321402C (de) * 1915-11-02 1920-06-02 Heinrich Schmidt Kaminkuehler mit Berieselungseinbau
FR687458A (fr) * 1929-12-31 1930-08-08 Demag Ag Tour de refroidissement à noyau vide
US2631022A (en) * 1948-10-08 1953-03-10 Hudson Engineering Corp Cooling tower
FR1271857A (fr) * 1960-10-14 1961-09-15 Perfectionnements aux tours de réfrigération de liquides par ruissellement
FR1351499A (fr) * 1962-12-20 1964-02-07 Perfectionnements aux appareils refroidisseurs de liquide
US3318586A (en) * 1965-01-11 1967-05-09 Meredith Diven Mass transfer unit using spaced flexible materials, and method of construction
US3659623A (en) * 1969-12-02 1972-05-02 Baltimore Aircoil Co Inc Water supply system
FR2215597A1 (de) * 1973-01-26 1974-08-23 Phelps Peter
DE2505617A1 (de) * 1974-02-22 1975-08-28 Munters Ab Carl Kontaktapparat fuer luft und wasser
FR2270539A2 (en) * 1974-03-22 1975-12-05 Hamon Sobelco Sa Cooling tower with direct and indirect cooling elements - mounted above each other, giving control of outlet air humidity

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FR1138128A (fr) * 1954-12-21 1957-06-11 Perfectionnements aux appareils échangeurs de chaleur notamment aux appareils refroidisseurs d'eau
US2809818A (en) * 1955-06-23 1957-10-15 Munters Carl Georg Gas and liquid contact apparatus
US3265550A (en) * 1957-07-10 1966-08-09 Munters & Co Carl Process of making a packing unit of moisture absorbent cellulosic material
US3132190A (en) * 1961-10-12 1964-05-05 Baltimore Aircoil Co Inc Heat exchange apparatus
SE311371B (de) * 1966-01-26 1969-06-09 Munters C
SE325589B (de) * 1967-02-21 1970-07-06 C G Munters
US3754738A (en) * 1968-07-05 1973-08-28 Blazer Corp Cooling tower apparatus
US3903212A (en) * 1973-07-10 1975-09-02 Cottrell Res Inc Fan-assisted cooling tower and method of operation
US4286321A (en) * 1979-06-18 1981-08-25 International Business Machines Corporation Common bus communication system in which the width of the address field is greater than the number of lines on the bus
US4530804A (en) * 1981-01-22 1985-07-23 Baltimore Aircoil Company, Inc. Forced draft cross flow, free-plenum evaporative heat exchanger
IT1152955B (it) * 1982-05-03 1987-01-14 Favra Int Torre di raffreddamento perfezionata del tipo a controcorrente avente dimensioni ridotte in pianta
US4548766A (en) * 1984-05-07 1985-10-22 Marley Cooling Tower Company Vacuum formable water cooling tower film fill sheet with integral spacers

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE321402C (de) * 1915-11-02 1920-06-02 Heinrich Schmidt Kaminkuehler mit Berieselungseinbau
FR687458A (fr) * 1929-12-31 1930-08-08 Demag Ag Tour de refroidissement à noyau vide
US2631022A (en) * 1948-10-08 1953-03-10 Hudson Engineering Corp Cooling tower
FR1271857A (fr) * 1960-10-14 1961-09-15 Perfectionnements aux tours de réfrigération de liquides par ruissellement
FR1351499A (fr) * 1962-12-20 1964-02-07 Perfectionnements aux appareils refroidisseurs de liquide
US3318586A (en) * 1965-01-11 1967-05-09 Meredith Diven Mass transfer unit using spaced flexible materials, and method of construction
US3659623A (en) * 1969-12-02 1972-05-02 Baltimore Aircoil Co Inc Water supply system
FR2215597A1 (de) * 1973-01-26 1974-08-23 Phelps Peter
DE2505617A1 (de) * 1974-02-22 1975-08-28 Munters Ab Carl Kontaktapparat fuer luft und wasser
FR2270539A2 (en) * 1974-03-22 1975-12-05 Hamon Sobelco Sa Cooling tower with direct and indirect cooling elements - mounted above each other, giving control of outlet air humidity

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2168899A1 (es) * 1998-05-11 2002-06-16 John Albert Davis Construccion mejorada de una torre de refrigeracion.
WO2012072829A1 (es) * 2010-11-29 2012-06-07 Zincobre Ingenieria, S.L.U. Torre de refrigeración y método de limpieza
CN110906755A (zh) * 2019-12-04 2020-03-24 寇金臣 一种尾气回收节能冷却塔

Also Published As

Publication number Publication date
ATE100572T1 (de) 1994-02-15
PT89785B (pt) 1994-09-30
AR243275A1 (es) 1993-07-30
KR940008437B1 (ko) 1994-09-14
NO890397L (no) 1989-08-23
US4873028A (en) 1989-10-10
CN1036631A (zh) 1989-10-25
IE890550L (en) 1989-08-22
PH26165A (en) 1992-03-18
DE68912361D1 (de) 1994-03-03
MX172682B (es) 1994-01-07
DK81589A (da) 1989-08-23
EP0330440B1 (de) 1994-01-19
IN171510B (de) 1992-10-31
PT89785A (pt) 1989-10-04
NZ227582A (en) 1991-04-26
IL88881A0 (en) 1989-08-15
AU2774089A (en) 1989-08-24
AU596941B2 (en) 1990-05-17
BR8900765A (pt) 1989-10-17
NO890397D0 (no) 1989-01-31
IE62060B1 (en) 1994-12-14
FI890745A0 (fi) 1989-02-16
IL88881A (en) 1994-08-26
ZA89187B (en) 1989-09-27
RU1819342C (ru) 1993-05-30
PL277861A1 (en) 1990-01-22
CN1014272B (zh) 1991-10-09
JPH01252894A (ja) 1989-10-09
CA1318239C (en) 1993-05-25
FI890745A (fi) 1989-08-23
DE68912361T2 (de) 1994-05-11
ES2050227T3 (es) 1994-05-16
DK81589D0 (da) 1989-02-22
KR890013450A (ko) 1989-09-23

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